* {
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
}

body {
  background-color: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  background-color: #fff;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 500px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #333;
}

input[type="text"] {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 15px;
  font-size: 16px;
}

.buttons {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 20px;
}

button {
  padding: 10px 20px;
  font-size: 15px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#add-todo {
  background-color: #4caf50;
  color: white;
}

#add-todo:hover {
  background-color: #43a047;
}

#clear-all {
  background-color: #f44336;
  color: white;
}

#clear-all:hover {
  background-color: #e53935;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: #f9f9f9;
  padding: 12px 15px;
  border-radius: 8px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.todo-content {
  flex-grow: 1;
  font-size: 16px;
  color: #333;
}

.todo-buttons {
  display: flex;
  gap: 8px;
  margin-left: 10px;
}

.todo-buttons button {
  background-color: #2196f3;
  color: white;
  padding: 8px 12px;
}

.todo-buttons button:hover {
  background-color: #1976d2;
}

.todo-buttons .edit-btn {
  background-color: #ff9800;
}

.todo-buttons .edit-btn:hover {
  background-color: #fb8c00;
}